Die and blank holding means



Oct. 12 1926. 1,602,411

F. J. RODE DIE AND BLANK HOLDING MEANS Filed Feb... 9. 1924 4 Sheets-Sheet l 7 ZTP//edra'c/z, J. ode

Oct. 12 1926.

F. J. RODE DIE AND BLANK HOLDING MEANS Filed Feb. 9. 1924 4 Sheets-Sheet Oct. 12 1926.

F. J. RODE DIE AND BLANK- HOLDING MEANS Filed Feb. 9. 1924 4 Sheets-Sheet Plea-5:0195

Oct. 12 1926. 1,602,411

F. J. RODE DIE AND BLANK HOLDING MEANS Filed Feb. 9. 1924 4 shets-sheet 4 PRESI URE SI1/P4 Y multiple-step cushionlng device be combined.

I Patented Oct. 12, 1926.

LIN-Treo l sTaTss PATENT Mami-i FREDRICH J. RODE, F CHICAGO, ILLINOIS, ASSIGNOR TO MARQUE'ITE TOOL & MANU- FACTURING CO., OF CHICAGO, ILLINOIS, 'A CORPORATION 0F ILLINOIS.

. DIE AND BLANK HOLDING MEANS.

Application led February 9, 1924. Serial No. 691,652.

This invention) relates to fluid pressure means for use in the drawing of metal shapes to a depth greater than is ordinarily 'possible to draw in one operation. This is accomplished by means of an arrangement of pistons and cylinders working coordinately so that after the shell is drawn to a certain shape and depth it is possible to advance certain parts ofi the dies and retard other parts of the dies so as to be able to reduce the diameter of the drawn shell and increase the depth thereof. This invention particularly relates to such a cushion which will render it possible to procure a very accurate and positive adjustment for themeans which control the. movement of L the different blank gripping members of the die, ordinarily termed draw rings. These draw rings are usually supported by what is known as die pins, the lower end of which die pins usually rest upon the cushioning means. In the practice of metal drawing it has been found that the commercial sheets of metal vary in thickness suiiicient to interfere with the drawing of a certain depth of shell in many cases, and lthese variations are of such an extent that often the sheets have to be measured as to thickness and asand accurately adjusting the parts 'of a cushl ioning device of' this character to vary'the strokes of the drawing movements of the dies, is one of the objects ofthis invention.

A further object of this invention4 is to provide improved means whereby such accurate and simple adjustments may in a with means which will retard the upward movement of the cushioning mechanism on the upstroke of the die. In the contsruc- 5 tion of some dieslfor the drawing of cersorted. To compensate these variations inl the accompanying drawings illustrating this invention and in which- Figure 1 is a view in longitudinal section of a portion of a draw press having a die and blank holding means constructed in accordance with the principles'of this invention applied thereto and showing the parts in their normal or initial position.

Figure 2 is a view similar to Figure 1, showing the parts in lanother position or in the position which they will assume just at the start of the second step in the o eration.

Figure 3 is a view similar tor` igure v2 of a modifiedfform` of the invention.

Figure 4 is a view similar to! Figure 3, showing the-parts in aposition just before `the completion of the second step of the operation. i .J

Referring more particularlyvto the draw;

'ings and to the form shown in Figures 1 and .2, the numeral 10 designates the supporting plate orfbolsterof a draw pressand 11 designateswthe'` reciprocating die lwhich latter is adapted to be' reciprocated in the ordinary and well-known' manner in ymachines of this character, the die -11 being 'provided with the usual knock-out device 12.

Supported by the bolster plate is a die o1" forming block 13, which may be of any to the article to be shaped and is secured in position in the ordinary and well-known manner.' l

' Encompassingthe forming bloc-k 13 is a desired size and configuration accordingblank holding ring 14 which is of any de' sire'd' configuration and is supported bymeans of suitable supporting 4pins y15 which pass loosely through the bolster ^plate 10 and preferably'engage andA rest upon a pressure plate 1.6. The lower end of the draw ring 14 preferably provided with a later-Y allyprojecting flangel? and encompassing A -the draw ring -li` is another draw ring 1'8 preferably provided with an inwardly pro-'- jecting flange 19 overhanging and adapted, at a predetermined stage in the operation of the device, to engage or stand in close proximity to the flange 17 of the draw ring 14. This draw ring 18 is. supported by pins 2() which also pass loosely through the plate 10 and engage and rest upon the end of a cylinder 21. y

The plate 16 is disposed between the lower face of the bolster plate 10 and the proximate face ofthe end of the cylinder 21.-

Supported by and depending from the bolster plate 10 are bars or rods 22, which may be of any desired length and connected with their lower extremities is a cross bar or member 23, to which latter are secured uprights 24 and supported by the uprights 24 1s a closed cylinder 25. Superposed upon the cylinder 25 is another closed cylinder 26, the upper end of the latter being preferably shaped to form a piston 27 which moves within the cylinder 21. The external diameters of the cylinders 25-.26 are preferably somewhat less than the internal diameter of the cylinder 21, the latter being of any desired length. Connected with the plate 16 and depending therefrom is al piston rod which passes through aA suitable packing orv bushing 29 in the head 29a of the cylinder 21 and also through a suitable bushing or packing 27a in the piston 27 so as to extend into the cylinder 26. Secured to the piston rod 28 and operating within the cylinder 26 is a piston 30. The cylinder -21 is supported by means of fluid pressure exerted1 therein through an opening 31 and to which vfopening is connected a supply pipe or conduit 32 which receives its pressure supply from any suitable source. Depending from the\cylin der 21 preferably from a flange or ears'33 connected therewith are bars or rods 34,

which are of any desired length and are preferably .provided with threads 35 at their free extremities. The threaded ends of the rods 34 pass loosely through a cross bar or member 36, and the rods 34 are provided with nuts or collars 37 on the threaded portions 35 thereof beneath the bar or member 36, and collars 38, which latter engage the threads 35 above the bar or member 36, lock nuts or collars 39 being provided for the collars 38, if desired. The uprights 24 preferably pass loosely through openings 40 in the bar or member 36 so as not to interfere with the movement of the latter and to guide it during the operation of the device.

vSecured to the bar or member 36 so as to move therewith vis a piston rod 41 which passes through a suitable bushing or packing 42 in the end of the cylinder 25 and carries apiston 43 which operates in the cylmder 25. Projecting from the piston rod Y 41 and beyond the piston. 43 is an extension 44 which projects through a suitable packmg vor bushing 45 in the head of the cylinder 26 and into the cylinder 26. This extension 44 is preferably arranged in alinement with the end of the piston rod 28 and is adapted to abut the end of the latter so as to hold the piston 30, piston rod 28, plate 16, pins 15 and draw ring 14 velevated at predetermined times in the operation of the device, so that the parts will be maintained in the position shown in Figure 1. Fluid pressure is supplied to the cylinder 25 below the piston 43 therein, from any suitable source and pref. erably through the medium of a pipe or conduit 46, so that when pressure is admitted through the pipe 46 beneath the piston 43 the end of the extension 44 will engage the end of the piston rod 28 to' hold the parts (vo-operating with the piston 30 and piston rod 28 from dropping downwardly.

The piston 30 is normally held elevated or lin the position shown in Figure 1-by means of fluid pressure` exerted in the cylinder 26 "and such fluid pressure may be supplied to the cylinder 26 from any 'suitable source through the medium of a pipe or conduit 47. An opening 48 is provided in the wall of the cylinder 26 on the side of the piston 3 0 opposite to the side on which the pressure'` supply pipe 47 has communication with the cylinder and forms a communication between the cylinder and the atmosphereiso that during the relative movement of the piston 30 and the cylinder 26 in one direction katmospheric air will be sucked into the cylinder l i and piston 43 as the opening 48 serves for the cylinder 26 and piston 30.

In the operation of this device it is desired i to hold the draw 'ring 14 against movement with respect to the die 13 during the first step or period of operation in the forming of the blank, that is until the Vdraw ring 18 has reached the limit of its movement with respect to the die 13 at the end of the first step in the operation of forming the blank, after which movement is imparted to the draw ring 14. The time of operation of the draw ring 14 is controlledby means of the rods 34 and the collars or nuts 38 as will be manifest by reason of the zfact that in the initial position of the apparatus as shown in Figure 1, iiuid pressure is being exerted in the cylinder 21 to hold up the draw ring?, 18 and fluid pressureis also being exerted in the cylinder 26 to holdup the draw ring 14 ISU ' 1,602,41 1 y my through the medium of the pins 15, plate 16, piston rod 28 and piston 30. Pressure is also exerted in the cylinder 25 and this pressure is exerted upon the piston 43 to. cause the extension 44 of the piston rod 41 to engage the end of the piston rod 28 to lock, so to speak, or hold the draw ring 14 from moving downwardly, it of course being ,\understood that the pressure in the cylinderI 21 is less than the combined pressures in the cylinders' 25 and 26. In the second step of the operation it may not be necessary to exert as much pressure upon the draw ring 14 as is necessary upon the draw ring 18 at the beginning of the operation but, if the pressure-in the cylinder 26 is not sul'licient to resist the movement of t-he draw ring 14 under the action of the die 11, it will be manifest that the draw ring 14 would also be moved on the first step of the operation which l would cause damage to the work. Therefore in order to maintain a pressure in the cylinder 26 lower than the pressure in the cylinder 21 and at the same time hold the draw ring 14 against movement until the proper time in the operation of the device, the'holding means 44 is provided for the draw ring 14. This holding means being connected with the piston 43, will operate as desired if suicient pressure is exerted in the cylinv der 25and therefore a greater pressure is supplied to the der 26.

It will therefore be manifest that upon the first stage or stepv of the operation the draw ring 18 will be lowered against the pressure in the cylinder 21 and the material 50 will be shaped over the die 13 and draw ring 14 as shown in Figure 2. Just at the completion of the first step of the operation and just as the parts assume or reach the position shown in Figure 2, the inuts or collars 38 will engage the bar or rod 36 and depress .the latter against the pressure in the cylinder cylinder 25 than to the cylin- 25, causing the piston 43 to-be mbved against such pressure or in the cylinderl 25 a suicient distance to move the extremity of the extension 44 out of-contact with the end of -the piston 28 lor into the position shown in Figure 2. The end of the extension 44 will be maintained spaced from the end of the piston rod 28. or in the position shown in Figure 2, and the die 11 will then operate upon the material in conjunction with the draw ring 14 to depress the latter with the plate 16, piston rod 28 and piston 30 against v 4 the fluid pressurer in the cylinder 26.

As the pistons 43 and 30 descend atmos- Yfpheric air will be drawn into the respective cylinders so as not to interfere with their operation. When the ram of thepress begins toascend to carry with it the die 11, pressures in the cylinders 21 and 26 will cause the 'drawrings 18 and 14 to follow up with the die.

'rod 28 until the nuts'or collars 38 on the rods 34 pass out of\engagement with the bar or member 36. At this time pressure in the cyl- 'inder 25 will move the end of the extension 44 into engagement with the end of the piston rod 28 and the arts will then assume the position shown in Figure 1,-at which time the upper surfaces of the draw rings 18 and 17 will be substantially flush with the upper surface of the die 13, so that a new sheet of material 50 may be placed into position so asto rest against these surfaces and ready for the next operation.

Obviously the initial degrees of pressure in the various cylinders may be proportioned according to the work to be performed.

During the operation of this device fluid pressure is admitted into the respective cylinders through supply pipes 32, 46 and 47 to move the parts in one direction with respect to each other and during the operation of the parts in the opposite direction with respect to each other and against such Huid pressure the Huid in the respective cylinders will be discharged therefrom back to the sources of supply through the respective pipes 32, 46 and 47.

lt may sometimes be desired or sadvisable to maintain the draw rings 18 and 17 against return movement with the die 11, that is to restrain them for any predetermined period of time to permit the die 11 to recede in advance of the draw rings. In that event the apparatus may be so constructed to be operated to attain that end and in so doing the openings 48 and 49 leading to the atmosphere from the cylinders 26 and 25 will be dispensed with. f

lln this instance and as shown in Figures 3 and 4 of the drawings, there is provided. a f iuid pressure supply pipe 51 which leads from any suitable source of supply and has communication with the top of the cylinder 26 preferably through a passage 52 in the piston rod 28. A pipe 53 also has communication with the top of the cylinder 25 and' this pipe 53 is connected with any suit-l able source of fluid pressure supply.

ln each of the pipes V32, 51 and'53 there is arranged a three-way valve 54, and as the construction and operation of each of these .valves is the-same, the description of one will a ply equally as well to themall.

rJlhe va ve consists of a casing provided with an opening 55 to which a pipe 56 is connected and leads from the. source of pressure supply. The pipe 53 is connected with another opening 57 in the valve casing and the casing is provided with an outlet 58 leading to the atmosphere. Within the lcasing 54 is a valve 59 having aA passage 60 therein, g and which` passage is of a conguration that when the valve 59 is in one position the pipe 53 will be connected with the pipe 56 to permit fluid pressure to How to the cylinder 25 and out of the cylinder back to the source of pressure supp and the outlet 58 will be closed. The valve 59 Vis adapted to be moved to another position sides of the pistons may be controlled andby causing a greater pressure to be exerted upon the upper side of .the piston than is exerted upon the lower side it will be manifest that the parts may be retained or locked in their lowermost position. Obviously the pressure on the opposite sides of the piston 30 in the cylinder 26 may be equalized and only a suliicient excess pressure may be admitted to the lower side ofthe piston-43, which will be sufficient to raise the pistons.

The valves 59 may be actuated in any desired or suitable manner but are preferably adapted to be automatically operated through the medium of a bar or rod 61 adapted to be connected 'to some movable part of the press. Adjustably mounted upon the rod 61 are fingers or tappets 62-63, which are adapted to engage a pin or projection 64 on an arm or link 65, which is connected with the valve lmember 59. As

' the bar or rod 61 descends the finger or tapthe invention shown in Figures 3 and 4 is the same as that described in connection -With the form shown in Figures 1 and .2.

While the preferred forms of the invention have been herein shown and described it is to be understood that various changes may be made in the details of construction and in the. combinationand arrangement of the several parts, within the scope of the claims, without departing from the spirit of this invention.

What is claimed as new is 1. A draw press including a plunger, a plurality of blank holding means adapted. to co-operate with the plunger to clamp the Work, one of said blank holding means being rendered active in advance of the other, means connected with the active blank holdin means for restraining the said other blank holding means against operation, the last said means embodying a connection between the active blank holding means and the said restraining means operating to permit independent movement of thel blank means and being responsive in its operation to the movement of the active blank ating to permit independent movement of the blank holding means.

3. A draw press including a plunger, a plurality of blank holding means adapted to co-operate with the-plunger to clamp the work, one of the blank holdingmeansrbeing rendered active in advance of the other, means for securing one of the blank holding means against operation, and a connection between the active `blank holding means and the said securing means for releasing the blank holding means secured by the securing means, the said connection operating to permitindependent movements of the blank holding means and embodying means for varying at will the point in the cycle of operation of the press at which the said connection will influence the said securing means.

4.`A draw press including a plunger, a plurality of blank holding means'adapted to co-operate with the plunger to clamp the Work, Huid pressure controlled means for locking one of Athe blank holding means.

against operation during the operationy of the other of the blank holding means, and means -movable with the last recited blank holding means and operating to actuate the said locking means against, the said fluid pressure to permit the blank holding means which is locked by the said fluid controlled means to become active.

5. A draw press including a plunger, a plurality of blank holding means adapted llO to co-operate with the plunger to clamp the Y Work, fluid pressure controlled means for locking one of the blank holding `means against operation during the operation of' the other of the blank holding means, and means movable with the last recited blank holding means and operating to' actuate the said locking means against the said fluid pressure to permit the blank' holding means which is locked vby the said fluid controlled means to become active, the third recited means embodying formations whereby the timeof operation thereof 'upon the said' means for securing one of the said blank holding means against operation, and connections between the other one of the blank holding means and the said locking means `for rendering the latter inactive by the movement of the last said blank holding means, the said connection operating to permit independent movement of the blank holding means.

f 7. A draw press including a plunger, a plurality of iuid pressure controlled blank holding means adapted to co-operate with the plunger to clamp!I the wor-k, locking means for securing one of the said blank holding means against operation, and connections between the other one of the blank holding means and the said locking means for rendering the latter inactive by the movement of the last said blank holding means, the said connectonsincluding formations permitting a predetermined extent of movement of one of the blank holding means before the other blank holding means f is unlocked.

8. A draw press including a plunger, a plurality of fluid pressure controlled blank holding means adapted to co-operate with the plunger to clamp the. work, lockin-'g means for securing one of the said'blank holding means against operation, and connections between the other one of the blank holding means and the said locking means for rendering the latter inactive by the movement of the last said blank holding means, the said connections including formations for varying at will the point in the cycle of operation of the press at which the said locking means will be rendered inactive.

9. A draw press including a plunger, a plurality of fluid presure controlled blank olding means adapted to co-operate with the lplunger to `clamp the work, fluid pressure controlled locking means for securing one of the said blank holding means against actuation, and means connected with one of the blank holding means and operating against the stress of the fluid pressure of the said lookin means to render the latter inactive by t e movement of the last said blank holding means.

10. A draw press including aplunger, a plurality of fluid pressure controlled blank holding means adapted to co-operate with the plunger to clamp the work, fluid pressure controlled locking means for :securing one of the said blank holding means against actuation, and positive mechanical means connected with one of the blank holding means and operating against the. stress of the fluid pressure of the said locking means to render the latter inactive. by thefmovement of the last said blank holding means.

11. A draw pr'ess including a. plunger, a

plurality of fluid pressure controlled blank holding means adapted to co-operate with the plunger to clamp the work, iuid pres sure controlled locking means for securing one of 'the said blank holding means against actuation, and means connected with one of the blank vholding means and operating against the stress of the fluid pressure of the said .locking means to render the latter inactive by the movement of the last said blank holding means, the last recited means, including provisions for varying at will the time in the cycle of operation of the press at which the said locking means will be rendered inactive.

l2. A draw press including a plunger, a plurality of blank holding means adapted to co-operate with the plunger to clamp the Work, one of said blank holding means being rendered active lin advance of the other, means for restraining the said other blank hold; ng means against actuation, means connected with the active blank holding means for rendering the said restraining means inactive by the movement of thevlast said blank holding means, and means for restraining the blank holding means against return movement with'the said plun er.

13. A draw press inc uding a plunger, a

.plurality of blank holding means adapted to co-operate with the plunger to clam the work, one of said blank holding means eing rendered active in advance of the other,

means for restraining the said other blank holding means against actuation, means connected with the active blank holding means for rendering the said restraining means inactive by the movement of the last said blank holding means, and luid pressure means for restraining the blank holding means against return movement with the said plunger. e

14. A draw press including a plunger, a plurality of blank holding means adapted to co-operate with the plunger to clamp the work, one of said blank holding means being rendered active in advance of the other, means for restraining the said other blank holding means against actuation,means con 15. A draw press including a pilunger, a L

plurality of Huid controlled bla holding means adapted to co-operate with the plunger to clamp the Work, one of said fiuid oo n- `trolled means including a cylinder and p1ston movable relatively one with relation'to the other, means for locking the said cyl1nder and piston against such relative movement vvhile one of the blank holding means remains active, and means responsive to the movement of the active blank holding means for rendering the said locking means 1nactive. l

16.' A draw' press including a plunger, a plurality of fluid controlled blank holding means adapted to co-operate With the plungerl to clamp the Work, one of said fluid controlled means including a cylinder and piston movable relatively one with relation to the other, means for locking the said cylinder and piston against such relative movement While one of the blank holdi'ng means remains active, means responsive to the movement of the active blank holding means for rendering the said locking means inactive, and means for restraining the blank holding means against return movement With the said plunger.

17. A draw press including a plunger, a

plurality of fluid controlled blank holding means adapted to co-operate with the plunger to clamp the Work, one of said fluid controlled means including a cylinder and piston movable relatively one with relation to the other, means for locking the said cylinder and piston against such relative lmovement While one of the blank holding means remains active, and means connected with one of the blank holding means and movable therewith for rendering the said locking means inactive.

18. A draw press including a plunger, a plurality of fluid controlled blank holding means adapted to co-operate with the plunger to clamp the Work, one of said uid controlled means including a cylinder and piston movable relatively one with relation to the other, means for locking the said cylinder and piston against such relative Inovement While one of the blank holding means remains active, means connected With one of the blank holding means and movable therewith for rendering the 'said locking f means inactive, and fluid pressure means operable at a predetermined point in the operation of the press for restraining said' 4cylinder and piston against relativemovement.

19. A Idravv press including a plunger, a plurality of blank holding means adapted to eo-operate With the` plunger for clamping the Work, fluid pressure cushioning means for the said blank holding means, one of the said'cushioning means including a cylinder and a piston relatively movable one with relation to the other, a second cylinder and piston, means connected withv the last recited .piston and projecting into the first said cylinder to enga-ge the piston therein to lock the latter and its co-operating cylinder against relative movement, and means operating automatically to shift the last yrecited means to release the parts locked thereby. 20. A draw press including a plunger, a plurality of blank holding .means adapted to co-operate with the plunger for clamping the Work, fluid pressure cushioning meansv for the said blank holding means, one of the said cushioning means includingacylinder and piston relatively movable one With relation to the other, a second cylinder and piston, means connected with the last recited piston and projecting into the first said cylinder to engage the piston therein to lock the latter and its co-operating cylinder against relative movement, and positive means connected With one of the blank holding means for shifting the last recited means to release the parts'locked thereby. 2l. A draw press including a plunger` a plurality of blank holding means adapted to co-operate with the plunger for clamping the Work, fluid pressure cushioning means for the said blank holding means, one of the said cushioning means including a cylinder and piston relatively movable one with relation to the other, a second cylinder and piston, means connected With the last recited piston and projecting into the first said cylinder to engage the piston therein to lock the latter and its co-operating cylinder against relative movement, means operating automatically to shift the last recited means to release the -parts locked thereby, and-fluid pressure means for restraining the blank holding means against return movement With the said plunger.

22. A draw press including a plunger, a plurality of blank holding means adapted to co-operate With the plunger to clamp the Work, Huid pressure controlled means for locking one of the blank holding means against operation during the operation of the other of the blank holding means, means movable With the last recited blank holding means and operating to actuate the Said locking means against the said fluid pressure to permit the blank holding means i means and operating 'to actuate the said locking means against the said fluid pressure to permit the blank holding means which is looked by the said fluid controlled f means to become active, the third recited means embodying formations whereby the time of operation thereof upon the said fluid controlled means, during the cycle of operation of the press, may be Varied at Will, and

mechanism for actuating the last recited 10 blank holding means and the means to release the Huid pressure which holds the other blank holder locked.

In testimony whereof I have signed m name to this specification on this 5th day 15 of February, A. D. 1924.

FREDRICH J. RODE. 

